I think the shadowed out pokemon is a Ninetales evolution
It has a lot of similarities
Like the mouth, head hair, and Ninetails is a Kitsune. A fox demon that is able to transform into humans. Just look at the silhouete and look at Ninetails.
Ninetales, like Vulpix, are based on foxes. However, in Japan there are certain legends concerning foxes, or kitsune, as they are known there. One such legend which relates to Ninetales the most is how many-tailed foxes can breathe fire, create illusions, and have extremely long lifespans. After living a long time, these creatures take on spirit forms, which may be the reason why these two related Pokémon can learn Ghost-type moves.
"In Just Waiting On A Friend", a very old Ninetales befriended Brock, who bore a resemblance to her long lost master. This Ninetales created all sorts of illusions, including one of a woman through which it spoke.
Lets not forget how much emphasis has been put on nine tails in the past. Heck it was the main plot point in the first mystery dungeon!